in amazon-sns-trigger-server/src/main/java/jetbrains/buildServer/clouds/amazon/sns/trigger/service/SnsBuildTriggeringPolicy.java [97:100]
private SnsNotificationDto getLatest(Map<String, SnsNotificationDto> registeredMessages) {
return registeredMessages.values().stream().max(Comparator.comparing(SnsNotificationDto::getTimestamp))
.orElseThrow(() -> new IllegalStateException("Comparator returned null for list of messages. This should never happen"));
}